Improvement in fillings for fire-proof safes



COATING OR PLASTIC.

FREDERIO VILHELM BERG MEIDELL, OF COPENHAGEN, DENMARK.

IMPROVEMENT IN FILLINGS FOR FIRE-PROOF SAFES.

Specification forming part of Letters Patent No. 155,661, dated October 6, 18 4 application filed August 10, 1874.

To all whom 'it may concern:

Be .it known that I, FREDERIC VILHELM BERG MEIDELL. of Copenhagen, in the Kingdom of Denmark, have invented a new and Improved Filling for Fire Proof Safes, of which the following is a specification:

This invention has for its object to produce a new filling for the walls of fire-proof safes, which will be cheap and durable, and efl'ectually guard the contents of the safe against a severe fire.

The invention consists in compounding certain substances, in the manner hereinafter described.

, The mixture I propose to use as filling for fire-proof safes consists of the following-named substances, taken in about the proportions named, to wit: Seven parts of chalk one part of pi )e-clay, and seven parts of sawdust prefefim y'flimfi beech-trees. me ingredients I add suflioient silicate of soda of about 30 Baum to transfomss info apasty consistency.

, This paste should be well kneaded, and is then gliowgdm aporate in dry air at a temperature of about fiil Fahrenheit. The mass is then spread upon theinner lining of the safe, so as to obtain the requisite shape, and is then exposed to a gradually-increasing heat, and,

finallv to a stron flame which will turn the sawdust that 1s on the surface of the mixture E'xmme:

PATENT QFFICE.

A ter the mass has been removed from the flames, and while itis gradually cooling, it is )lun ed into a bath of the silicate of soda and 1s 11a y covere wita 1n aver o ri ehulls WW The finished preparation, after being com-* pletely cooled, will be found to be as hard as stone and an excellent non conductor of heat. It may either be placed wit-bin the walls of thef; safe, so as to completely fill the space between1 fv them, or it may be applied in layers, so tha 1 air-spaces will be left between every pair ot layers, and between the layers and the wall?" of the safe.

I claim as my invention The filling for fire-proof safes composed o chalk, clay, sawdust, and silicate of soda, substantially as specified.

- In testimonywhereof I have signed my name to this specification in the presence of the subscribing witnesses.

F. V. B. MEIDELL.

Witnesses:

A. STEINBERG, J. METHLING. 

